Shahbazi Fatemeh, Ghasemi Somayeh, Sodaiezadeh Hamid, Ayaseh Kobra, Zamani-Ahmadmahmoodi Rasool
Graduate Student of Environmental Science, Faculty of Natural Resources and Desert Studies, Yazd University, Yazd, Iran.
Department of Soil Sciences, Faculty of Natural Resources and Desert Studies, Yazd University, Yazd, Iran.
Environ Sci Pollut Res Int. 2017 Jun;24(18):15634-15644. doi: 10.1007/s11356-017-9178-z. Epub 2017 May 18.
The use of sewage sludge in agricultural soils can improve soil physical and chemical properties and soil fertility by increasing organic materials; however, the presence of heavy metals in sewage sludge is a significant problem for the quality of agricultural products and the environment. Most heavy metals, due to their inactive nature, are stable and can affect human health. This study investigates the effect of sewage sludge on the concentration of copper, zinc, cadmium, lead, iron, and manganese in two varieties of wheat, i.e., Sivand (Triticum aestivum cv. Sivand) and Roshan (Triticum aestivum cv. Roshan). Results were obtained from a factorial experiment in a completely randomized design with three replications and at three levels (0, 60, and 120 kg soil) and were carried out in a research greenhouse. This research concluded that in the treated seed and stem of Sivand variety, concentrations of Zn, Cd, Fe, and Mn were below the standard toxicity limit, and concentrations of Cu and Pb were above the standard limit. In the Roshan variety, the concentrations of Zn, Cd, Pb, Fe, and Mn were below the standard limit, and Cu concentration was above the standard. The results of this study lead to the recommendation that farmers avoid using sewage sludge in farming, as much as possible. Instead, it is far more appropriately employed as a fertilizer for green space, ornamental trees, and parks, where edible products for human consumption are not grown.
在农业土壤中使用污水污泥可以通过增加有机物质来改善土壤的物理和化学性质以及土壤肥力；然而，污水污泥中重金属的存在对农产品质量和环境来说是一个重大问题。大多数重金属因其惰性，性质稳定，会影响人体健康。本研究调查了污水污泥对两个小麦品种，即西万德（普通小麦品种西万德）和罗珊（普通小麦品种罗珊）中铜、锌、镉、铅、铁和锰含量的影响。结果来自于一项析因实验，采用完全随机设计，有三个重复，设置了三个水平（0、60和120千克土壤），实验在研究温室中进行。本研究得出结论，在西万德品种经过处理的种子和茎中，锌、镉、铁和锰的含量低于标准毒性限值，而铜和铅的含量高于标准限值。在罗珊品种中，锌、镉、铅、铁和锰的含量低于标准限值，而铜的含量高于标准。本研究结果建议农民尽可能避免在农业中使用污水污泥。相反，它更适合用作绿地、观赏树木和公园的肥料，这些地方不种植供人类食用的产品。
